JP2008085386A - In-vehicle antenna mounting structure - Google Patents

Abstract

The mounting workability of a vehicle-mounted antenna is improved.
An antenna unit disposed on an outer surface of a vehicle body, and a connecting member disposed on an inner surface side of the vehicle body connected to the antenna unit via an attachment hole of the vehicle body, the antenna unit including a casing, A mounting plate that is fitted into the vehicle body mounting side opening of the casing and has a bolt cylinder portion provided with a male screw on the outer peripheral surface, a circuit board that is housed in a housing chamber surrounded by the casing and the mounting plate, and the circuit An antenna element connected to the base end of the circuit board and protruded outward from the casing; and a first connection terminal connected to a conductor of the circuit board and protruded into the bolt cylinder portion, the connection member comprising: A nut provided with an internal thread threadedly engaged with the bolt cylinder, and a second connection terminal connected to an electric wire end and projectingly held at the center position of the nut; Communicate and distribute When the nut of the connecting member and the bolt cylinder portion of the antenna uni inserted from the outside of the vehicle through the mounting hole are fitted, the first connecting terminal is connected to the second connecting terminal. Selected figure] Figure 1

Description

  The present invention relates to a mounting structure for a vehicle-mounted antenna and improves mounting workability.

Conventionally, as a vehicle antenna unit, for example, Japanese Patent No. 3513070 (Patent Document 1) provides an apparatus shown in FIGS. In this antenna unit 1, a circuit board 3 fixed to a base metal fitting 2 is covered with a casing 4, and an antenna part 5 containing an antenna element (not shown) is detachably attached to the upper part of the casing 4. .
The base metal fitting 2 is provided with a cable insertion tube portion 6 that leads out the antenna signal line W1 and the like connected to the circuit board 3 and fits into the insertion hole on the vehicle body side, and protrudes on the lower surface side. Bolts 7 for fixing the vehicle body are attached and protruded on the lower surface side.
However, in the antenna unit 1 having the above-described configuration, it is necessary to provide a hole for inserting a cable and a plurality of mounting holes for the bolt 7 on the base metal fitting 2 side and the vehicle body side, respectively.

On the other hand, in the antenna unit 1 ′ shown in FIG. 5 provided in Japanese Patent Laid-Open No. 11-274732 (Patent Document 2), a male screw portion 8 for fixing the vehicle body is integrally projected on the lower surface side of the base metal fitting 2 ′. The hole 8a provided in the axial direction of the male screw portion 8 is used as a cable insertion hole. As a result, the vehicle body B and the base metal fitting 2 ′ are provided with through-holes each serving as a cable insertion hole and a bolt mounting hole one by one.
The antenna unit 1 ′ passes the male screw portion 8 through the mounting hole of the vehicle body B after passing the antenna signal line W1 or the like led out through the hole 8a through the mounting hole on the vehicle body B side and pulling it into the vehicle interior side. The nut 9 is screwed and fixed to the vehicle body B.

However, both of the antenna units 1 and 1 ′ of Patent Documents 1 and 2 are
1) Pass the signal line through the hole in the car body.
2) Pass the bolt 7 (or male screw portion 8) for fixing the antenna unit through the mounting hole on the vehicle body side.
3) Fix the antenna unit to the vehicle body by tightening the nut.
4) A signal line or the like is connected to a predetermined connection destination via a connector or the like.
4 steps are required, and there is a problem in workability.

  In addition, when multiple antenna elements are built in one antenna unit, the number of wires passed through the through-holes increases. In the case of passing through, there is also a problem that the through hole is narrowed by a line that has already passed, and the subsequent line work becomes difficult. In addition, if the said through-hole is enlarged, although a workability | operativity of wiring can be improved, it is not preferable to make a large through-hole in a vehicle body.

Japanese Patent No. 3513070 Japanese Patent Laid-Open No. 11-274832

  The present invention has been made in view of the above problems, and an object thereof is to provide a mounting structure for a vehicle-mounted antenna with good mounting workability.

In order to solve the above problems, the present invention includes an antenna unit disposed on an outer surface of a vehicle body, and a connecting member disposed on the inner surface side of the vehicle body in connection with the antenna unit via an attachment hole of the vehicle body,
The antenna unit includes a casing, a mounting plate that is fitted into a vehicle body mounting side opening of the casing and is provided with a projecting bolt cylinder portion having a male screw on the outer peripheral surface, and a housing chamber surrounded by the casing and the mounting plate. A circuit board housed in the circuit board, an antenna element connected to the base end of the circuit board and protruded outward from the casing, and a first connection connected to a conductor of the circuit board and protruded into the bolt cylinder portion With a terminal,
The connection member includes a nut provided on an inner peripheral surface with a female screw that is screwed into the bolt cylinder portion, and a second connection terminal that is connected to an electric wire terminal and is protruded and held at the center position of the nut,
When the nut of the connecting member arranged in communication with the mounting hole of the vehicle body and the bolt cylinder portion of the antenna uni inserted from the outside of the vehicle through the mounting hole are fitted, the first connecting terminal is connected to the second connecting terminal. An on-vehicle antenna mounting structure is provided that is configured to be fitted and connected.

In the antenna mounting structure according to the present invention, the bolt cylinder portion of the antenna unit and the nut of the connecting member on the vehicle body side are fitted to each other, thereby performing mechanical connection work for fixing the antenna unit to the vehicle body, and at the same time, The first connecting terminal and the second connecting terminal in the nut are fitted. Thereby, the electrical connection work of the circuit board of the antenna unit and the electric wires such as the antenna signal line and the power supply line can be performed simultaneously.
The electrical connection is such that a first connection terminal that is connected to the circuit board and protrudes in the bolt cylinder portion is fitted with a second connection terminal that is connected to the wire terminal and protrudes in the nut. Therefore, it is not necessary to insert the electric wire into the mounting hole of the vehicle body, and the conventional wiring work can be omitted.

  Furthermore, even when a plurality of antenna elements are built in the antenna unit, the plurality of first connection terminals connected to the antenna elements may be fitted and connected to the plurality of second connection terminals connected to the nut-side electric wires, respectively. . In this way, since the wiring work for the through hole of the vehicle body is unnecessary, problems such as an increase in the number of processes due to an increase in the number of electric wires and difficulty in the wiring work do not occur.

  In addition, the portion that performs inter-terminal connection by fitting the bolt cylinder portion with the nut of the connection member includes a generally used high-frequency connector structure, an in-vehicle high-frequency connector structure, a consumer multipolar connector structure, and the like. It may be a thing.

The second connection terminal of the connection member has an L shape having a vertical portion and a horizontal portion, and the vertical portion is held and protruded by a holding material inside the nut, and the horizontal portion protrudes from the base end side of the nut. And connecting with the core wire protruding from the electric wire terminal routed along the vehicle body, and
The nut is rotatable with respect to the holding member, and the nut is rotated and screwed to the bolt cylinder portion of the antenna unit.
For example, the antenna unit is attached to the outer surface of the roof of the vehicle body, the second connection terminal is L-shaped, and the wiring connected to the second connection terminal is connected to the narrow gap between the lube and the interior lining (ceiling). It is routed.
In addition, on the connection member side, when an annular uneven fitting portion is provided on the outer peripheral surface of the holding member that holds the second connection terminal and the inner peripheral surface of the nut so as to be slidable, the bolt cylinder portion of the antenna unit Thus, the nut side can be rotated and screwed, so that the direction of the antenna can be made constant.

The mounting plate of the antenna unit is made of metal, the conductor connected to the ground element of the antenna is connected to the mounting plate, and
The nut of the connection member is made of metal, the electric wire connected to the second connection terminal is a coaxial cable, and the second connection terminal is soldered to the core wire exposed from the end of the core wire of the coaxial cable. The drain wire protruding from the end of the coaxial cable is brought into contact with the nut, and the ground circuit of the antenna unit is connected to the coaxial cable via the bolt cylinder and the nut. It is preferably connected to a drain wire.

  That is, since the bolt cylinder part is in contact with the inner peripheral surface of the mounting hole, which is a metal exposed part of the vehicle body, the ground circuit and the coaxial cable of the antenna unit can be grounded through the bolt cylinder part. Further, the ground circuit of the antenna unit can be installed on the vehicle body side through the shield layer of the coaxial cable. In this way, the ground circuit of the antenna and the shield layer of the coaxial cable can be easily grounded, noise can be prevented from entering the coaxial cable, and good reception performance can be ensured.

It is preferable that a flange portion that contacts the inner surface of the vehicle body is provided on the outer peripheral surface of the nut of the connecting member, or that the nut is contacted to the inner surface of the vehicle body via a washer.
Thereby, it can prevent that the front-end | tip of a nut digs into the vehicle body inner surface, and can prevent loosening of a nut tightening, rattling of an antenna unit, etc.

As described above, according to the present invention, the operation of fixing the antenna unit to the vehicle body by fitting the bolt cylindrical portion protruding from the mounting plate of the antenna unit and the nut of the connecting member arranged on the vehicle body side, and the antenna The operation of electrically connecting the circuit board of the unit and electric wires such as an antenna signal line and a power supply line can be performed simultaneously. On the other hand, since the terminals are connected to each other inside the nut on the inner surface side of the vehicle body, it is not necessary to perform a wire connection work to the mounting hole of the vehicle body.
As a result, the number of steps for mounting the antenna can be reduced, and the mounting workability can be improved.

  In addition, even when multiple antenna elements are provided in one antenna unit, there is no need for wiring work, so problems such as increased man-hours and difficulty in wiring work do not occur, and antenna signal lines and power lines It is also possible to reduce the number of man-hours for connecting to the predetermined connection destination.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a mounting structure for a vehicle-mounted antenna according to a first embodiment of the present invention.
The in-vehicle antenna mounting device 10 includes an antenna unit 11 disposed on the outer surface of the roof of the vehicle body and a connection member 31 disposed on the inner surface of the roof for transmitting and receiving signals.

The antenna unit 11 has a metal mounting plate 13 fitted to the inner peripheral edge of the vehicle body attachment side opening of the casing 12 made of insulating resin, and an annular rubber on the peripheral end surface of the vehicle body attachment side opening of the casing 12. The waterproofing member 14 made from is fitted.
When the antenna unit 11 is attached to the outer surface of the vehicle body, the rubber waterproofing member 14 is elastically deformed to seal between the vehicle body mounting side end surface of the casing 12 and the vehicle body 50, and is surrounded by the mounting plate 13 and the casing 12. In this structure, water is prevented from entering the storage chamber 15 and from the mounting hole 51 into the vehicle.

In the storage chamber 15, the circuit board 16 is fixed and stored on the upper surface of the mounting plate 13.
The circuit board 16 is provided with a signal circuit conductor 17 and an earth circuit conductor 18, and an input end of the signal circuit conductor 17 is inserted through an antenna mounting bracket 19 and a connection bracket 20 which are insert-molded at the upper end portion of the casing 12. Connected.
The ground circuit conductor 18 is connected to the mounting plate 13 via a connection fitting 21.

A female screw is formed on the antenna mounting bracket 19, and an antenna portion 22 is detachably mounted on the antenna mounting bracket 19.
The antenna unit 22 houses the antenna element 23 therein, and the conductive fitting 24 connected to the base end portion of the antenna element 23 is screwed to the antenna mounting bracket 19, thereby the signal circuit conductor 17 and the antenna element. 23 is electrically connected.

  The mounting plate 13 is provided with a male screw 26 on the outer peripheral surface, and a bolt cylinder portion 25 having an axial through hole 27 formed therein and projecting integrally on the vehicle body mounting side. A first holding material 28 in which a first connection terminal 29 is embedded is fitted in the through hole 27 of the bolt cylinder portion 25, and the elastic contact piece 29 a at the tip of the first connection terminal 29 is connected to the through hole 27. Protrusively held at the center position inside. The other end of the first connection terminal 29 penetrates the circuit board 16 and is solder-connected to the signal circuit conductor 17.

In the connecting member 31, a female screw 34 that is screwed into the male screw 26 of the bolt cylinder part 25 is provided on the inner peripheral surface of the front end side of the through hole 33 in the axial direction of the cylindrical metal nut 32. Yes.
Further, a second holding member 36 in which a second connection terminal 38 is embedded is fitted to the inner peripheral edge of the base end side (bottom side) of the through hole 33. Specifically, an annular convex portion 35 projecting inward from the inner peripheral surface of the base end side of the through hole 33 is fitted into an annular groove 37 recessed in the outer peripheral surface of the second holding member 36 so as to be relatively rotatable, and a nut. 32 is rotatable.

  The second connection terminal 38 is an L-shaped terminal having a vertical part 38 a and a horizontal part 38 b, and the vertical part 38 a is a second terminal so that the tip part protrudes to the center position in the through hole 33 of the nut 32. It is held by the holding material 36. The horizontal portion 38 b extends from the base end side of the second holding member 36 and protrudes from the base end side of the nut 32.

  The horizontal portion 38b of the second connection terminal 38 is connected to the signal line 41 of the coaxial cable. Specifically, the signal line 41 is connected to the horizontal portion 38b of the second connection terminal 38 by soldering the core wire 42 exposed from the end of the core line. Further, the end of the drain wire 43 protruding from the end of the signal line 41 is pushed into and connected to a recess 32x formed in an annular shape at the base end of the nut 32.

  A cover member 45 made of an insulating resin is fitted on the outer peripheral surface of the base end side of the nut 32 so as to cover the base end portion of the nut 32. More specifically, an annular groove 39 that is recessed on the outer peripheral surface of the base end side of the nut 32 is fitted with an annular convex portion 46 that protrudes inward from the peripheral edge on the mounting side of the cover member 45, so that the nut is attached to the cover member 45. 32 is connected to be rotatable.

  The cover member 45 covers the horizontal portion 38b of the second connection terminal 38 protruding from the base end side of the nut 32, the core wire 42 and the drain wire 43 exposed from the insulating coating 44 of the signal line 41, and a side surface. The signal line 41 is pulled out in the horizontal direction from the insertion hole 47 provided in the.

When mounting the vehicle-mounted antenna 10 having the above-described configuration to the vehicle body 50, first, as shown in FIG. 1, the washer 49 and the through-hole of the connection member 31 communicate with the mounting hole 51 of the vehicle body 50 from the inside of the vehicle. Hold on.
Next, the bolt cylinder portion 25 of the antenna unit 11 is inserted into the mounting hole 51 of the vehicle body from the outside of the vehicle, and the washer 49 is attached to the connection member 31 inside the vehicle, and the nut 32 of the connection member 31 is rotated. The bolt cylinder portion 25 is screwed. At that time, since the second holding member 36 and the cover member 45 that hold the second connection terminal 38 connected to the communication line 41 of the coaxial cable are rotatable relative to the nut 32, they are interlocked even if the nut 32 rotates. Thus, it can be held at a fixed position without rotating.

Thus, by rotating and fitting the nut 32 to the bolt cylinder portion 25, the antenna unit 11 is held in a predetermined direction without being rotated with respect to the vehicle body 50 as shown in FIG. It can be fixed by rotating the nut 32 of the connecting member 31 inside the vehicle. At the same time, the first connection terminal 29 connected to the signal circuit board 17 of the antenna unit 11 and the second connection terminal 38 connected to the signal line 41 of the coaxial cable can be electrically connected.
Further, since the signal line 41 is routed only inside the vehicle and does not need to be routed outside the vehicle, the operation of inserting the signal line 41 into the mounting hole 51 of the vehicle body 50 is also unnecessary. Therefore, it is possible to reduce the man-hours for the antenna mounting work, and the workability is improved.

  Further, since the second connection terminal 38 has an L shape, the coaxial cable including the signal line 41 connected to the second connection terminal 38 can be routed along the surface of the vehicle body 50, and the narrow gap But it can be routed in a space-saving manner.

Further, since the signal line 41 is a coaxial cable and the drain line 43 is connected to the metal nut 32, it can be grounded to the vehicle body 50 via the bolt cylinder portion 25 screwed into the nut 32. Noise mixing in the antenna signal line 41 and electromagnetic wave leakage from the antenna signal line 41 can be prevented.
Further, since the earth circuit conductor 18 in the antenna unit 11 is connected to the metal mounting plate 13, the vehicle body 50 can be grounded through the bolt cylinder portion 25 of the mounting plate 13, and the antenna receiving performance is good. Can be kept in.
Furthermore, since the washer 49 is sandwiched between the tip of the nut 32 and the vehicle body 50, the tip of the nut 32 can be prevented from sinking into the inner surface of the vehicle body 50, and loosening of the tightening force by the nut 32 can be prevented.

FIG. 3 shows a second embodiment of the present invention, in which a flange 40 that contacts the inner surface of the vehicle body 50 is formed on the outer peripheral surface of the nut 32.
This flange 40 can prevent the end of the nut 32 from being pulled in without using the washer 49.

It is explanatory sectional drawing which shows the attachment operation | work to the vehicle body of the vehicle-mounted antenna which concerns on 1st embodiment of this invention. It is sectional drawing which shows the state which attached the vehicle-mounted antenna to the vehicle body. It is sectional drawing which shows the attachment structure of the vehicle-mounted antenna which concerns on 2nd embodiment of this invention. (A) (B) is a figure of a prior art example. It is a figure of another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Car-mounted antenna 11 Antenna unit 12 Casing 13 Mounting plate 16 Circuit board 23 Antenna element 25 Bolt cylinder part 26 Male screw 29 1st connection terminal 31 Connection member 32 Nut 34 Female screw 36 2nd holding material 38 2nd connection terminal 41 Electric wire ( Antenna signal line)
50 Body 51 Mounting hole

Claims (4)

An antenna unit disposed on the outer surface of the vehicle body, and a connecting member disposed on the inner surface side of the vehicle body connected to the antenna unit via the mounting hole of the vehicle body,
The antenna unit includes a casing, a mounting plate that is fitted into a vehicle body mounting side opening of the casing and is provided with a projecting bolt cylinder portion having a male screw on the outer peripheral surface, and a housing chamber surrounded by the casing and the mounting plate. A circuit board housed in the circuit board, an antenna element connected to the base end of the circuit board and protruded outward from the casing, and a first connection connected to a conductor of the circuit board and protruded into the bolt cylinder portion With a terminal,
The connection member includes a nut provided on an inner peripheral surface with a female screw that is screwed into the bolt cylinder portion, and a second connection terminal that is connected to an electric wire terminal and is protruded and held at the center position of the nut,
When the nut of the connecting member arranged in communication with the mounting hole of the vehicle body and the bolt cylinder portion of the antenna uni inserted from the outside of the vehicle through the mounting hole are fitted, the first connecting terminal is connected to the second connecting terminal. An on-vehicle antenna mounting structure characterized by being configured to be fitted and connected. The second connection terminal of the connection member has an L shape having a vertical portion and a horizontal portion, and the vertical portion is held and protruded by a holding material inside the nut, and the horizontal portion protrudes from the base end side of the nut. And connecting with the core wire protruding from the electric wire terminal routed along the vehicle body, and
The on-vehicle antenna mounting structure according to claim 1, wherein the nut is rotatable with respect to the holding member, and the nut is rotated and screwed to a bolt cylinder portion of the antenna unit. The mounting plate of the antenna unit is made of metal, the conductor connected to the ground element of the antenna is connected to the mounting plate, and
The nut of the connection member is made of metal, the electric wire connected to the second connection terminal is a coaxial cable, and the second connection terminal is soldered to the core wire exposed from the end of the core wire of the coaxial cable. The drain wire protruding from the end of the coaxial cable is brought into contact with the nut, and the ground circuit of the antenna unit is connected to the coaxial cable via the bolt cylinder and the nut. The in-vehicle antenna mounting structure according to claim 1 or 2, wherein the mounting structure is electrically connected to the drain wire.   The flange part which contact | abuts the inner surface of a vehicle body is provided in the outer peripheral surface of the said nut of the said connection member, or this nut is made to contact | abut to the inner surface of a vehicle body via a washer. Mounting structure for in-vehicle antennas.

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